We've got a nice 10x20' greenscreen backdrop we've used for years... I don't even remember where we got it, but it was pretty darn expensive.
Last year we needed another one that size because we were doing a greenscreen shoot in a
huge area that we needed to cover. Sort of as an experiment, I ordered one of these...
http://www.tubetape.net/servlet/the-7/screen-greenscreen-background-10/Deta...
...because they were super inexpensive. If figured it was worth testing, and minimal cash outlay in case it was a dud and I needed to get something better.
I have to say I was very pleasantly surprised by the quality. It's just as good as the one we paid a lot more for. It is (I think) thin cotton muslin. It doesn't wrinkle too badly, and if you can hang it at least the day before your shoot most if not all of the wrinkles will fall out. We also keep a pump-up bottle full of anti-wrinkle liquid handy for when we need it in a hurry, but rarely have to use it.
T2
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Todd Terry
Creative Director
Fantastic Plastic Entertainment, Inc.
fantasticplastic.com